During All-Access one of the things Garcia told Maidana was,
"Throw a lot of punches, but don't get too close so that you can throw the straight right hand."
Controlling the distance is one of the most important things you can do in a fight. The fighter who keeps the fight where he wants it wins the fight on overwhelming amount of the time. Needless to say, Floyd is a master of it. I showed some clips on it during a film study for the rematch
Mayweather vs Maidana Film Study Analysis
The thing is even though Garcia is giving Maidana the correct instructions, that doesn't mean he's going to be able to execute it against Mayweather come fight night. Floyd has every advantage; footwork, footspeed, handspeed, defensive ability, ability to adapt etc. Now on top of all that Mayweather has decided to work with Ariza. Guaranteed he comes in to this fight with more muscle than we've ever seen him with before. I think Floyd's ego is pushing him to go for the stoppage on this one.